GSM Won't Open? Convert to AU Instantly
Fast, instant GSM to AU conversion. No signup required. Just drop your .gsm file and get .au in seconds.
Batch Settings
还在为GSM格式的语音文件发愁吗？尤其是在微信里收到朋友发来的语音，或是游戏里导出的音频，想在更多设备上流畅播放，又或者想导入到专业音频软件里编辑，却发现兼容性不佳？别担心，我们懂您的烦恼。GSM，作为一种历史悠久的语音编码格式，虽然文件小巧，但在跨平台播放和后期处理上确实会遇到一些小麻烦。而AU格式，作为Sun Microsystems早期推出的音频标准，以其简洁的头部信息和相对良好的兼容性，在特定场景下依然有着不可替代的优势。将GSM转换为AU，就好比为您的语音文件找到了一把万能钥匙，让它能在更多地方“开口说话”，无论是老旧的播放器，还是某些特定软件环境，都能轻松应对。现在，就让我们帮您解决这个小难题，让您的音频文件在不同设备间无缝流通，享受更顺畅的数字体验。
- 微信语音转存与编辑
- 老旧游戏音频兼容
- 专业音频软件导入
在大陆及台湾地区，GSM语音文件常见于老式手机录音或某些早期VoIP应用，转换为AU格式有助于在不常见播放环境（如某些嵌入式系统或特定音频工作站）中进行处理。
About GSM to AU Conversion
Dealing with a GSM file that won't open on your device? You're not alone — GSM compatibility issues are one of the most common reasons people search for a file converter. GSM is a widely used file format.
The fix is simple: convert your GSM to AU. AU is a widely used file format. This conversion lets you convert between formats quickly, solving the problem in seconds rather than hours of troubleshooting.
Converting GSM to AU maintains high quality with CocoConvert's optimised encoder settings.
CocoConvert processes your GSM file on secure servers in Germany — upload, convert, download. Your files are encrypted via TLS and automatically deleted within 24 hours. No account needed, no software to install, and it works on any device with a browser.
This conversion is ideal when you When you need a AU file.
The conversion engine behind CocoConvert uses FFmpeg, Sharp, and qpdf — the same open-source libraries trusted by Netflix, YouTube, and enterprise platforms. Pro users can batch convert up to 100 files at once.
How to Convert GSM to AU
- 1
Add your GSM file
Drag and drop your .gsm file into the converter, or tap "Browse" to pick it from your device. Multiple files are supported for batch processing.
- 2
Pick AU output
Select .au as the target format. CocoConvert automatically applies the best quality settings for this conversion.
- 3
Start conversion
Hit the Convert button. The audio engine processes your file server-side — no CPU drain on your device.
- 4
Save your file
Once done, download your .au file. For batch jobs, download all at once as a zip.
What Happens When You Convert GSM to AU
Your GSM file is decoded and re-encoded as AU.
Your GSM file is uploaded and validated
The file is decoded (parsed into its raw data)
The data is re-encoded in AU format
The converted file is ready for download
Format Comparison
GSM
.gsm file
| Extension | .gsm |
| MIME Type | audio/gsm |
| Category | Audio |
AU
.au file
| Extension | .au |
| MIME Type | audio/basic |
| Category | Audio |
Should You Convert GSM to AU?
When to Convert
- ✓When you need a AU file
Frequently Asked Questions
Why won't my GSM file open?
GSM files may not open if your device lacks the right codec or application. Converting to AU — a more widely supported format — usually resolves this. AU is a widely used file format.
Is it safe to convert GSM to AU online?
Yes. CocoConvert encrypts your file via TLS, processes it on isolated servers in Germany, and permanently deletes it within 24 hours. Your files are never shared or analysed.
Will I lose quality converting GSM to AU?
Converting GSM to AU maintains high quality with CocoConvert's optimised encoder settings. CocoConvert uses high-quality encoder defaults to preserve as much fidelity as possible.
How large can my GSM file be?
Free users can convert files up to 250 MB each. Pro users get a 5 GB limit per file, and Business API users have custom limits.
Can I convert GSM to AU on my phone?
Absolutely. CocoConvert works in any modern browser — iOS Safari, Android Chrome, and all desktop browsers. No app required.
Versions are pinned in our worker Dockerfile and re-built via CI on every change.